Great game! Fun to play and easy rules to understand.
I'm leaving a review because I noticed the few recent reviews said that the game was broken/glitchy. I can happily report that I just finished the game with all achievements and had no issues playing the game.
I will add that the achievement that took me the longest to get was by far "destroy 250 ships." So, make sure you're sinking the ships and not just shooting down their sails if you're going for all achievements. Even if you're not, achievements are linked to upgrades. The grinding to get this one is my only complaint about this game.